SHAP skill: what it does and how to install it

What it does. Guides SHAP analysis from defining the model output and background population through explainer and masker selection, modern shap.Explanation computation, additivity checks, and local or global plots. Covers tabular, multi-output, text, image, cohort and model-agnostic workflows, with troubleshooting and reporting guidance.

When to use it. Use it to audit how a fixed model maps inputs to outputs. It does not replace predictive validation or establish causality, fairness, recourse, or scientific mechanism.